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Keywords from Image Description:
balchen and riiserlarsen balchenandriiserlarsen aviation aviator explorer polar explorer polarexplorer bernt balchen berntbalchen balchen SDASM.CATALOG Balchen SDASM.TITLE Balchen and RiiserLarsen SDASM.DATE SDASM.ADDITIONAL INFORMATION Balchen and RiiserLarsen on the first polar crossing of commercial SAS aircraft SDASM.COLLECTION